![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
A cuboid steel is 2 meters long and its cross section is a square with a side length of 5 cm. If there is 7.8 kg of steel per cubic decimeter, how much does the steel weigh Kilogram?
2m = 20 decimeters, 5cm = 0.5 decimeters
0.5X0.5X20X7.8
=5X7.8
=39kg
A cuboid copper is 2m long, with a cross-sectional area of 25cm2. The weight of copper per cubic decimeter is 8.9kg. How many kg does this copper weigh?
Cuboid copper volume = 20 × 0.25 = 5DM & sup3;
Mass = 5 × 8.9 = 44.5kg
A 1.8m long rectangular copper bar with a cross section of 5cm long is 8.9kg without cubic decimeter, if it is forged to 90cm long
5cm wide rectangular copper plate [consumption not included], how thick is the copper plate?
Volume = 0.5 × 0.5 × 18 = 4.5 cubic decimeter
Thickness = 4.5 ﹣ 9 ﹣ 0.5 = 1 decimeter
A cuboid steel is 4m long and its cross section is a square with 5cm side length. If there is no cubic decimeter, the steel weighs 7.8kg. How many kg does this steel weigh?
Weight = volume (side length x side length x length) x specific gravity
Known: side length = 5 cm = 0.5 decimeter, length = 4 M = 40 decimeter; specific gravity = 7.8 kg / cubic decimeter
So: weight = 0.5 decimeter x 0.5 decimeter x 40 decimeter x 7.8 kg / cubic decimeter
=78 kg
A: this steel weighs 78 kg
RELATED INFORMATIONS
- 1. A cuboid steel is 4.8m long, and its cross section is a square with 5cm side length?
- 2. One cubic decimeter iron weighs 7.8 kg. There is a rectangular iron block with a square bottom, which weighs 93.6 kg. It is known that the side length of the square is 20 cm. How long is the iron block?
- 3. What is the difference between molecular weight and relative molecular mass, atomic weight and relative atomic mass?
- 4. The relative atomic weight of iron is 56. The relative atomic weight of magnesium is 24. 100g. The one in magnesium and 100g iron contains more electrons
- 5. What is atomic weight?
- 6. The law between the number of protons, neutrons, extranuclear electrons and relative atomic weight Anything else? Five
- 7. The chemical formula of the oxide of a metal element M is mcl3 It's better to solve it now
- 8. The chemical formula of the compound produced by the combination of the most abundant nonmetallic elements and the most abundant metallic elements in the crust is______ ．
- 9. The relative atomic mass of a divalent metal element is () A. 24B. 40C. 56D. 64
- 10. The mass ratio of metal to oxygen in the oxide of a divalent metal is 5:2. The relative atomic mass of the metal is () A. 24B. 65C. 40D. 64
- 11. The density of copper is 8900 kg / M and the molar mass of copper is 0.064 kg / mol
- 12. The molar mass of copper is 63.5g/mol, and the density is 8.9 * 10 ^ 3kg / m ^ 3, It is estimated that the free electron number density of the copper dollar table is 4*10^28m^-3 I don't know how to get the answer
- 13. At a certain temperature, the density of the saturated solution of a substance with molar mass m is ρ, and the mass concentration of the substance is C? At a certain temperature, the density of the saturated solution of a material with a molar mass of M is ρ, and the mass concentration of the material is C. what is the mass fraction of solute in the solution? The answer of the exercise is (cm / 10 ρ)%, which is cm of 10 ρ, followed by a%,
- 14. The density ratio is equal to the molar mass of the substance How do you remember?
- 15. The mass ratio of C, O and h in an organic matter is 6:4:1. The relative density of vapor to air of the organic matter is 1, 518. The molar mass of the organic matter is calculated According to the title "the relative density of the organic matter vapor to air is 1, 518", the relative density of the organic matter is 44, and its molar mass is 44 Is molar mass equal to relative density?
- 16. It is known that the density of iron is higher than that of aluminum, which indicates that the mass of iron and aluminum with equal volume is larger, and the volume of iron and aluminum with equal mass is larger
- 17. How many moles of aluminum ions are there in 0.2 moles of aluminum sulfate
- 18. Molar mass problem When a certain amount of liquid compound XY2 is completely burned in a certain amount of oxygen, the equation is XY2 (L) + 3O2 (g) = xo2 (g) + 2yo2 (g). After cooling, the volume of the product is 672 ml and the density is 2.56 g / L under the standard condition?
- 19. When a mole of sodium and a mole of aluminum are put into m g of sufficient water, the density of the solution is d g / cm3, and the percent capacity of the solution is 0___
- 20. How to calculate the resistivity of aluminum clad steel